the complete question in the attached figure
we know that
radius of a circle r=5 ft
Area of a circle=pi*r²--------> pi*5²------> 25pi ft²
if the area of 360° (full circle) is------------> 25pi
72° (central angle)------------------> X
X=72*25pi/360-------------> 5pi ft²
the area of triangle=2.9*4----------> 11.6 ft°
then
the area of the shaded portion of the circle=[5pi-11.6] ft²
the answer is
the area of the shaded portion of the circle is [5pi-11.6] ft²
